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EP3637585A1 - Segmentierter stator für einen elektrischen generator - Google Patents

Segmentierter stator für einen elektrischen generator Download PDF

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Publication number
EP3637585A1
EP3637585A1 EP18199398.1A EP18199398A EP3637585A1 EP 3637585 A1 EP3637585 A1 EP 3637585A1 EP 18199398 A EP18199398 A EP 18199398A EP 3637585 A1 EP3637585 A1 EP 3637585A1
Authority
EP
European Patent Office
Prior art keywords
stator
segment
end slot
straps
coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18199398.1A
Other languages
English (en)
French (fr)
Inventor
Ziad Azar
Erik Groendahl
Subhra Samanta
Arwyn Thomas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Gamesa Renewable Energy AS
Original Assignee
Siemens Gamesa Renewable Energy AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Gamesa Renewable Energy AS filed Critical Siemens Gamesa Renewable Energy AS
Priority to EP18199398.1A priority Critical patent/EP3637585A1/de
Publication of EP3637585A1 publication Critical patent/EP3637585A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/52—Fastening salient pole windings or connections thereto
    • H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
    • H02K3/522—Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/12—Machines characterised by the modularity of some components
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
    • H02K7/1807—Rotary generators
    • H02K7/1823—Rotary generators structurally associated with turbines or similar engines
    • H02K7/183—Rotary generators structurally associated with turbines or similar engines wherein the turbine is a wind turbine
    • H02K7/1838—Generators mounted in a nacelle or similar structure of a horizontal axis wind turbine
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • the present invention relates to a segmented stator for a direct drive electrical generator, e.g. a direct drive electrical generator for a wind power turbine.
  • the present invention also relates to a method of manufacturing a stator for an electric generator.
  • An electrical generator such as an electric generator installed in a wind turbine, typically comprises a rotor which rotates relative to a stator.
  • the stator normally comprises a frame body longitudinally extending along a longitudinal axis and including a stator yoke and a plurality of teeth protruding according to a radial direction from the stator yoke.
  • a plurality of slots are also defined, each slot being delimited circumferentially by two adjacent teeth and radially extending between the stator yoke and respective tooth radial ends.
  • Each slot houses a respective winding.
  • direct drive electrical generators in particular large direct drive electrical generators to be used in a wind power turbine, including a stator having a segmented structure.
  • the stator segments may be arranged to cover for example an arc of 30, 60, 90, 120 degrees (or any other angle) along the circumferential direction of the stator.
  • the stator segments are circumferentially joined together to form the stator (for example a stator may comprise six stator segments, each covering an arc of 60 degrees). For such type of stator it may be desirable to use a concentrated winding topology.
  • a segmented stator with a double-layer distributed winding i.e. a winding with two coils in the same slot
  • the main inconvenience of such procedure is to secure mechanical support at the circumferential end of each segment. Due to the coil design topology, at each of its extreme circumferential ends the stator segment must comprise a respective slot and not a tooth. This happens because each coil from one slot has to enter the next adjacent slot.
  • each half tooth to be joined to a correspondent half tooth of an adjacent segment the slots of the stator segment adjacent to the half teeth would be half empty, as the empty half would have to include windings from the adjacent stator segment.
  • one slot would be provided at one circumferential end of the stator segment (with a tooth provided at the other circumferential end of the stator segment). This is obviously in contrast with the requirement of manufacturing complete segments already including the windings, to be joined together to form the complete stator.
  • stator design combining efficiently a concentrated winding topology or a double-layer distributed winding topology with a segmented design of the stator.
  • a stator segment for a stator of an electrical generator.
  • the stator segment includes a segment body and a coil winding.
  • the segment body circumferentially extends between at least a first end slot and a second end slot, each of the first end slot and of the second end slot being circumferentially extended between at least a tooth of the segment body and a respective first side opening and second side opening, the segment body circumferentially spanning between the first side opening and the second side opening, the coil winding including a first side coil and a second side coil respectively housed in the first end slot and in the second end slot.
  • the stator segment includes at the first end slot and second end slot at least two straps for respectively retaining the first side coil and the second side coil in the first end slot and in the second end slot.
  • trap it is meant a thin band of material, which may by a non-conductive material, e.g. glass fiber or composite, or stainless steel, as further specified in the following.
  • the coil winding may be a coil concentrated winding or a double-layer coil distributed winding.
  • the segment body longitudinally extends along a longitudinal axis of the stator segment and includes a plurality of stator axial portions, two adjacent stator axial portions being separated by a cooling duct for letting a cooling fluid flow in the cooling duct, at least one of the straps extending, at least partially, in a respective cooling duct.
  • the first strap and/or the second strap may be oriented transversal to the longitudinal axis of the stator segment.
  • at least one of the straps is configured in a closed loop and includes at least a first side extending through the respective cooling duct.
  • each strap may include:
  • At least one of the straps is configured a spring active between a stator yoke of the segment body and a radial end of a tooth radially opposite to the stator yoke.
  • a spring may be made of stainless steel.
  • the stator segment comprises a plurality of straps at one or both of the end slot(s), the straps being distributed and distanced along the longitudinal axis for providing optimal support to the coils sides in the end slot(s).
  • a minimum number of straps should be used, the main support coming from sold resin of the VPI process.
  • each strap of one stator segment is distanced along the longitudinal axis from each strap of the other stator segment.
  • each stator segment includes at the first end slot and the second end slot a respective first plurality of straps and a second plurality of straps distributed along the longitudinal axis at the segment gap, the first plurality of straps being alternated to the second plurality of straps at the segment gap.
  • Figure 1 shows a wind turbine 1 comprising a tower 2, which is mounted on a non-depicted fundament.
  • a nacelle 3 is arranged on top of the tower 2.
  • the wind turbine 1 further comprises a wind rotor 5 having two, three or more blades 4 (in the perspective of Figure 1 only two blades 4 are visible).
  • the wind rotor 5 is rotatable around a rotational longitudinal axis Y.
  • the terms axial, radial and circumferential in the following are made with reference to the rotational axis Y.
  • the blades 4 extend radially with respect to the rotational axis Y.
  • the wind turbine 1 comprises a permanent magnet electric generator 100.
  • the wind rotor 5 is rotationally coupled with the permanent magnet generator 100 either directly or by means of a rotatable main shaft 9 and through a gear box (not shown in Figure 1 ).
  • a schematically depicted bearing assembly 8 is provided in order to hold in place the main shaft 9 and the rotor 5.
  • the rotatable main shaft 9 extends along the rotational axis Y.
  • the permanent magnet electric generator 100 includes a stator 20 and a rotor 30.
  • the rotor 30 is rotatable with respect to the stator 20 about the rotational axis Y.
  • the stator 20 comprises a plurality of stator segments 10.
  • a stator segment 10 comprises a segment body 11 longitudinally extending along the longitudinal axis Y.
  • the segment body 11 comprises a stator yoke 13 and a plurality of teeth 15 protruding according to a radial direction R orthogonal to the longitudinal axis Y from the stator yoke 13 up to respective tooth radial ends, where notches 36 for respectively attaching a plurality of wedges (as better clarified in the following) are provided.
  • the stator segment 10 further comprises a plurality of intermediate slots 23, each slot 23 circumferentially extending between two respective teeth 15, a first end slot and a second end slot 22.
  • the segment body 11 circumferentially extends between the first end slot 21 and the second end slot 22, each of the first end slot 21 and of the second end slot 22 being circumferentially extended between a respective tooth 15 (respectively, the first tooth 15 and the last tooth 15 of the stator segment 10) of the segment body 11 and a respective first side opening 31 and second side opening 32 of the segment body 11.
  • the segment body 11 circumferentially spans between the first side opening 31 and the second side opening 32.
  • the stator segment 10 further comprises a coil winding 12 in the slots 21, 22, 23 of the segment body 11.
  • the stator segment 10 may include any number of intermediate slots 23 circumferentially comprised between the first end slot 21 and the second end slot 22.
  • the circumferential extension of the first end slot 21 and the second end slot 22 is the half of the circumferential extension of the intermediate slot 23.
  • the smallest version of the stator segment 10 according to the present invention includes only one tooth between the first end slot 21 and of the second end slot 22, i.e. without any intermediate slot 23.
  • the coil winding 12 may be a coil concentrated winding or, alternatively, a double-layer coil distributed winding.
  • the coil winding 12 is of the double layer type, including two coils 43 in each intermediate slot 23, a first side coil 41 in the first end slot 21 and a second side coil 42 in the second end slot 22.
  • the segment body 11 longitudinally extends along the longitudinal axis Y including a plurality of stator axial portions 34 separated by cooling ducts 35. Two adjacent stator axial portions 34 are separated by a respective cooling duct 35 for letting a cooling fluid flow in the cooling duct 35.
  • an intermediate slot 23 comprised between two teeth 15 is represented.
  • two coils 43 are housed, radially extends between the stator yoke 13 and a wedge 51, closing the intermediate slot 23 at the radial ends of the two adjacent teeth 15.
  • the wedge 51 is attached to the two notches 36 respectively provided at the radial ends of the two adjacent teeth 15.
  • Each of the two coils 43 includes a main wall insulation 52.
  • the intermediate slot 23 there are further provided:
  • the second end slot 22 is represented in two different embodiment of the present invention.
  • the first end slot 21 is identical and symmetrical in shape.
  • the second side coil 42 is radially extended in the second end slot 22 between the stator yoke 13 and a wedge 61, closing the second end slot 22 at the radial end of the adjacent tooth 15.
  • the wedge 61 is attached to a notch 36 provided at the radial end of the adjacent tooth 15.
  • the wedge 61 has a circumferential dimension corresponding to the second end slot 22, i.e. half of the wedge 51 of the intermediate slots 23.
  • the side coil 42 includes a main wall insulation 62. In the second end slot 22 there are further provided:
  • the strap 71 is made a non-conductive material e.g. glass fiber roving materials used for coil end supports in large electric machines or composite materials.
  • a strap 81 is configured as a spring active between the stator yoke 13 of the segment body 11 and a radial end of the tooth 15 radially opposite to the stator yoke 13 and circumferential adjacent to the second end slot 22.
  • at least another strap 81 (not shown in the attached figures), symmetrically disposed with respect to the strap 81 of the second end slot 22, is provided for retaining the first side coil 41 in the first end slot 21.
  • the strap 81 is made of stainless steel.
  • the segment body 11 may include or not include the cooling duct 35.
  • stator segment 10 may be manufactured according to following method:

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Windings For Motors And Generators (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
EP18199398.1A 2018-10-09 2018-10-09 Segmentierter stator für einen elektrischen generator Withdrawn EP3637585A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18199398.1A EP3637585A1 (de) 2018-10-09 2018-10-09 Segmentierter stator für einen elektrischen generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18199398.1A EP3637585A1 (de) 2018-10-09 2018-10-09 Segmentierter stator für einen elektrischen generator

Publications (1)

Publication Number Publication Date
EP3637585A1 true EP3637585A1 (de) 2020-04-15

Family

ID=63832231

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18199398.1A Withdrawn EP3637585A1 (de) 2018-10-09 2018-10-09 Segmentierter stator für einen elektrischen generator

Country Status (1)

Country Link
EP (1) EP3637585A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3955421A1 (de) 2020-08-11 2022-02-16 Siemens Gamesa Renewable Energy A/S Segmentierter stator für einen generator mit einem band zur befestigung einer endspule
EP3975386A1 (de) * 2020-09-25 2022-03-30 Siemens Aktiengesellschaft Spulenfixierung an halboffenen nuten eines statorsegments
EP4170871A1 (de) * 2021-10-22 2023-04-26 General Electric Renovables España S.L. Elektrische maschinenzahnanordnungen und verfahren
US20230318366A1 (en) * 2020-06-30 2023-10-05 Siemens Gamesa Renewable Energy A/S Electrical machine having a segmented stator or rotor

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3437859A (en) * 1966-05-23 1969-04-08 Gen Electric Winding support structure for a dynamoelectric machine
US4297606A (en) * 1977-03-29 1981-10-27 Kraftwerk Union Aktiengesellschaft Method of bracing end turns of an electric machine by means of a binding band; and device used therein
US4330726A (en) * 1980-12-04 1982-05-18 General Electric Company Air-gap winding stator construction for dynamoelectric machine
JPS6370260U (de) * 1986-10-23 1988-05-11
CN1199950A (zh) * 1997-05-16 1998-11-25 株式会社日立制作所 旋转发电机的风冷结构
JP2010246269A (ja) * 2009-04-06 2010-10-28 Toyota Motor Corp インシュレータおよび回転電機
US20150130320A1 (en) * 2013-11-11 2015-05-14 Fanuc Corporation Stator of electric motor provided with coil fastening part, electric motor, and fastening method of unit coil

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3437859A (en) * 1966-05-23 1969-04-08 Gen Electric Winding support structure for a dynamoelectric machine
US4297606A (en) * 1977-03-29 1981-10-27 Kraftwerk Union Aktiengesellschaft Method of bracing end turns of an electric machine by means of a binding band; and device used therein
US4330726A (en) * 1980-12-04 1982-05-18 General Electric Company Air-gap winding stator construction for dynamoelectric machine
JPS6370260U (de) * 1986-10-23 1988-05-11
CN1199950A (zh) * 1997-05-16 1998-11-25 株式会社日立制作所 旋转发电机的风冷结构
JP2010246269A (ja) * 2009-04-06 2010-10-28 Toyota Motor Corp インシュレータおよび回転電機
US20150130320A1 (en) * 2013-11-11 2015-05-14 Fanuc Corporation Stator of electric motor provided with coil fastening part, electric motor, and fastening method of unit coil

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230318366A1 (en) * 2020-06-30 2023-10-05 Siemens Gamesa Renewable Energy A/S Electrical machine having a segmented stator or rotor
EP3955421A1 (de) 2020-08-11 2022-02-16 Siemens Gamesa Renewable Energy A/S Segmentierter stator für einen generator mit einem band zur befestigung einer endspule
WO2022033751A1 (en) 2020-08-11 2022-02-17 Siemens Gamesa Renewable Energy A/S Segmented stator for a generator, comprising a strap for fixing an end coil
EP3975386A1 (de) * 2020-09-25 2022-03-30 Siemens Aktiengesellschaft Spulenfixierung an halboffenen nuten eines statorsegments
EP4170871A1 (de) * 2021-10-22 2023-04-26 General Electric Renovables España S.L. Elektrische maschinenzahnanordnungen und verfahren

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